[CI] Stop passing provisioning profile to iOS workflows

Summary:
We don't need to be passing a provisioning profile for iOS workflows since they'll be pulled from AppStoreConnect anyways thanks to the -allowProvisioningUpdates flag passed to xcodebuild.

The provisioning profile we were previously passing was being ignored and replaced by both the app.comm and app.comm.NotificationService provisioning profiles.

Figured removing this would make things less misleading to any future readers.

Test Plan: Land and see what happens.

Reviewers: tomek, marcin, varun, ginsu, rohan, O2 Blocking Reviewers, ashoat

Reviewed By: ginsu, O2 Blocking Reviewers, ashoat

Subscribers: ashoat, abosh

Differential Revision: https://phab.comm.dev/D5554